Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a1eaa2ff068b1f…

MALICIOUS

PDF

97.2 KB Created: 2021-07-22 00:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52615dd7c596ce4bb0e183acf48c9f69 SHA-1: 56091ece55966e62bf4d43b583ac2db3208bde7d SHA-256: a3a1eaa2ff068b1f22ed4c357ea74a4649a7ba429a0b275ac866a798bc930c5c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs suggests an attempt to redirect the user to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feedproxy.google.com/~r/sq/ugae/~3/S-4CHg4Qmwo/square?utm_term=music+tone+song
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f73d3b9fae806368214c97/1626815803655/melosilabutedojabatamu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f27cc050974615f9197823/1626504384361/when_to_plant_glass_gem_corn.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9603fe64123bb482b53a/1626183171722/48977230740.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f36a2bc5d9e6782ce2d08c/1626565163892/tumbling_dice_song_meaning.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9626cf492d21a0f6cb989/1625907820797/willie_nelson_amy_lee_nelson.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec817159713006cbe131ad/1626112369958/introducing_new_pullets_to_flock.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f57d0fa8f65e35b6f2966b/1626701072022/new_south_movie_ram_charan_2020.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f277454b68c137e692f7c9/1626502981417/download_cheat_among_us_for_pc.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94ac537cb904475613d14/1625901765178/dnd_unearthed_arcana.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e9006cf4fe78435a393b4a/1625882732505/apostrophes_are_used_for.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3e6e3b386920ff6d23df3/1626597091992/materials_cost_variance.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efdfa7e9d3bc6103fc11b5/1626333095952/how_to_push_new_branch_git.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f797223fe7684a17b8c772/1626838818379/traffic_engineering_projects.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f629e9ea390a02402e7c70/1626745321281/fast_and_furious_7_blu_ray_1080p_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f385d7731d8c7c6fffb5f1/1626572247367/98931505753.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0940ead7d590e185b20fd/1626379278579/mov_or_mp4_better.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f88d0897ab3921c44c2947/1626901768734/endoscopic_ultrasound_cost.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f2276a4b68c137e68fbaae/1626482539006/why_is_potassium_more_reactive_than_lithium.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8826154eb17b684a7bad/1626114086237/constant_stomach_pain_for_days.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f84d48bd6002733aca6f85/1626885448981/zuniruvofafeme.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f88d3a50b1cd2c5b6ccf2c/1626901818742/all_app_hacking_apk.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94843db8bb141bada7f5f/1625901124022/another_word_for_intellectual.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92ea12c5c2f6215c97402/1625894561783/negates_the_need.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aac.bin
0489ad67a81416732942ac204bf5be904efab671c261ab426785a823aea37349
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 10192 bytes
font_01_sfnt_off000131a7.bin
630b2a2c0dafcbbef6d557e1ab4e709dd2f9a96b5c749e79718fa0ea8efdfba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 17568 bytes
font_02_sfnt_off00015f97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F97 16792 bytes